塔里木盆地中-下奥陶统鹰山组层序地层格架中的成岩作用——以塔河地区和柯坪巴楚露头区为例

doi:10.11743/ogg20170405

摘要/Abstract

摘要： 塔里木盆地中-下奥陶统鹰山组内幕储层的成因机制是当前油气勘探所关注的重点。以塔河地区钻井与柯坪巴楚露头为研究对象，利用岩石学与地球化学手段，对成岩作用在准层序、准层序组以及三级层序内的发育规律与演化特征展开研究。研究认为：沉积相带对成岩作用具有明显的控制作用，海水潜流成岩作用占据潮下带，潮间带则以海水潜流、渗流以及淡水潜流成岩作用为特征，潮上带以淡水渗流胶结物、同生期大气淡水溶蚀作用为特征；退积型准层序组，准层序顶部在海平面上升早期受大气淡水影响，海水成岩作用则在晚期主导旋回顶部；进积型准层序组，准层序在高水位早期以海水成岩作用为主，直至晚期顶部出现暴露；鹰山组下亚段三级层序，海平面上升期以同生期淡水成岩作用为特征，同时下倾方向胶结作用增加，高水位末期发育较弱的喀斯特；下亚段三级层序中的埋藏白云岩化作用发育强烈，云化流体以原生海水为主；上亚段三级层序在海泛面附近发育广泛海水胶结作用，快速的海侵使得同生期淡水成岩作用发育较弱，高水位期，受裂缝控制的表生溶蚀现象普遍存在。

关键词: 阴极发光, 成岩作用, 层序地层, 鹰山组, 奥陶系, 塔里木盆地

Abstract: Genetic mechanism of the Lower-Middle Ordovician Yingshan Formation reservoir in the Tarim Basin becomes a focus in the current exploration of the basin.Samples were taken from wells in Tahe area and Keping-Bachu outcrops to study the development and evolution of diagenesis in parasequence,parasequence set,third-order sequence stratigraphic framework,through petrology and geochemistry methods.The results show that the sedimentary facies significantly control the diagenesis.Tidal flat sedimentary environment is characterized by three zones:marine phreatic diagenesis in the subtidal,marine diagenetic environment and meteoric vadose environment in the intertidal,and meteoric water seepage cements associated with karst at the top of the parasequence in the supratidal.Regressive parasequence set developed syngenetic meteoric dissolution in early transgression,and marine diagenesis in late transgression stage.During early highstand period,parasequence were still affected by seawater diagenesis until the top of late thinning parasequence is exposed to subaerial environments.In the third-order sequence of the Lower Yingshan Formation,transgression is characterized by paleokarst controlled by parasequences and apparently increasing cementation to the down-dip.Weak karst developed du-ring the late highstand.Intense burial dolomitization appeared in the Lower Yingshan Formation.The remnant connate seawaters could be the main diagenetic fluids of dolomitization.In the third-order sequence of the Upper Yingshan Formation,seawater cementation is widely developed near marine flooding surface.The rapid transgression resulted in the development of weak syngenetic meteoric diagenesis.Epidiagenesis controlled by fractures developed in the Upper Yingshan Formation.

Key words: cathode luminescence, diagenesis, sequence stratigraphy, Yingshan Formation, Ordovician, Tarim Basin

中图分类号:

TE122.2

杜洋,樊太亮,高志前,等. 塔里木盆地中-下奥陶统鹰山组层序地层格架中的成岩作用——以塔河地区和柯坪巴楚露头区为例[J]. 石油与天然气地质, 2017, 38(4): 677-692. doi: 10.11743/ogg20170405 Du Yang,Fan Tailiang,Gao Zhiqian,et al. Diagenesis in sequence stratigraphic framework of the Lower-Middle Ordovician Yingshan Formation,Tarim Basin:A case study from Tahe area and Keping-Bachu outcrop[J]. Oil & Gas Geology, 2017, 38(4): 677-692. doi: 10.11743/ogg20170405

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